Akihiko Oka

Optical terminal system having self-monitoring function

Network traffic protection system

Add-drop multiplexer with enhancement of accessibility to signals in different hierarchical levels and flexibility in various services and circuit setting operations

Path protection switch ring system for line saving even though line setting operation was not carried out

Apparatus and method for interfacing between communication networks

Signal loopback device

Transmission apparatus with control circuit/relay within each card providing connection to related card output depending on related slot ID/ redundancy/non-redundancy, working/protection signals

Control operation device for hydrostatic continuously variable transmission

Auto-cruise device of moving vehicle

Interface unit for communication device with parts positioned on a printed-wiring board for achieving desirable operating characteristics